6. Free-Flying Nanobots

Setting up cameras to spy on your nanny or neighbors will be a thing of the past in 2033, thanks to DARPA’s free-flying nanobots, 10-gram robots that fly (and look) like mosquitoes or flies. It’s still a work in progress, though, as the battery life only allows it to fly 20 seconds at a time and it can currently withstand just 5 miles per hour of wind resistance. Once those kinks are worked out, however, you’ll have to come up with a way to rig water balloons to this mechanical menace.